. >> reporter: defense attorney bernard grossberg. what about some of the folks who do have rap sheet, who do have a history of criminal records, what about the idea of them walking the street here in massachusetts? >> well, we don't like some of these guys getting released. that's what the law requires. and we will do it because we're the commonwealth of massachusetts, and we try to do the right thing. >> reporter: grossberg says what happened in massachusetts should prompt other states to examine their own labs. >> i think in our system, our criminal justice system, there is nothing worse than an unfair, unconstitutional conviction. >> reporter: in dookhan is convicted, she could face more than 20 years in prison. elaine quijano, cbs news, boston. >> reid: a new report says drug ask alcohol abuse is on the rise among amtrak employees. among other findings the report says mechanics and signal operators tested positive at four time the rate of employees at other railroads last year. amtrak management said it will step up random drug t